linux-kernel - [PATCH 4.9 49/56] mdio-sun4i: Fix a memory leak

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Message-Id: <20180302084452.027864759@linuxfoundation.org>
Date:   Fri,  2 Mar 2018 09:51:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 49/56] mdio-sun4i: Fix a memory leak

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>


[ Upstream commit 56c0290202ab94a2f2780c449395d4ae8495fab4 ]

If the probing of the regulator is deferred, the memory allocated by
'mdiobus_alloc_size()' will be leaking.
It should be freed before the next call to 'sun4i_mdio_probe()' which will
reallocate it.

Fixes: 4bdcb1dd9feb ("net: Add MDIO bus driver for the Allwinner EMAC")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/mdio-sun4i.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/phy/mdio-sun4i.c
+++ b/drivers/net/phy/mdio-sun4i.c
@@ -118,8 +118,10 @@ static int sun4i_mdio_probe(struct platf
 
 	data->regulator = devm_regulator_get(&pdev->dev, "phy");
 	if (IS_ERR(data->regulator)) {
-		if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
+		if (PTR_ERR(data->regulator) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto err_out_free_mdiobus;
+		}
 
 		dev_info(&pdev->dev, "no regulator found\n");
 		data->regulator = NULL;